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diff --git a/decoders/avr_pdi/__init__.py b/decoders/avr_pdi/__init__.py
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+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2016 Gerhard Sittig <gerhard.sittig@gmx.net>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
+##
+
+'''
+PDI (Program and Debug Interface) is an Atmel proprietary interface for
+external programming and on-chip debugging of the device. See the Atmel
+Application Note AVR1612 "PDI programming driver" and the "Program and
+Debug Interface" section in the Xmega A manual for details.
+
+The protocol uses two pins: the RESET pin and one dedicated DATA pin.
+The RESET pin provides a clock, the DATA pin communicates serial frames
+with a start bit, eight data bits, an even parity bit, and two stop bits.
+Data communication is bidirectional and half duplex, the device will
+provide response data after reception of a respective request.
+
+Protocol frames communicate opcodes and their arguments, which provides
+random and sequential access to the device's address space. By accessing
+the registers of internal peripherals, especially the NVM controller,
+it's possible to identify the device, read from and write to several
+kinds of memory (signature rows, fuses and lock bits, internal flash and
+EEPROM, memory mapped peripherals), and to control execution of software
+on the device.
+'''
+
+from .pd import Decoder